For all those who have not yet purchased the latest episode of the popular war series from Activision, the publisher has just released a demo on Xbox Live single-player "posthumous" Call of Duty: Black Ops: the demo, the size of 916 MB ( web link ), include "reconnaissance on board SR-71 spy planes, base-jumping, downhill along the rocky slopes, deletions, and stealth of the enemy gunfire." As always, the demo is limited to users Live Gold for a week, after which it becomes accessible to users Silver.